Constant factor means



Nov. 21, 1950 H. GANG CONSTANT FACTOR MEANS 15 Sheets-Sheet 1 Filed Feb. 16, 1948 0 m m +0 6 9 x AWTQEM J 8 H0 0 6 M m m 00000000006 D mwmmwwwww Pu 0000000m00 D V w@ M m J "a D 0 J m H w H @o H INVEN'gR mane/n1 an BY iwfl bmorm vdo'n ATTORNEY Nov. 21, 1950 H. GANG CONSTANT FACTOR MEANS l5 Sheets-Sheet 2 Filed Feb. 16, 1948 m3 vmv INVENTOR llllllb Nov. 21, 1950 H. GANG CONSTANT FACTOR MEANS l5 Sheets-Sheet 3 Filed Feb. 16, 1948 8 .537 INVENTOR J/mm 9017, 5' (A) Gi/hzfmsw 161m A TTORNE Y4 Nov. 21, 1950 H. GANG CONSTANT FACTOR MEANS l5 Sheets-Sheet 4 Filed Feb. 16, 1948 INVENTOR 3mm ang, .01 Gm 50mm m.

A TTORNE Y5 Nov. 21, 1950 H. GANG 2,531,205

CONSTANT FACTOR MEANS Filed Feb. 16, 1948 15 Sheets-Sheet 5 INVENTOR M9027, BY CU ,QmGT /mm r401 A TTORNE Y Nov. 21, 1950 H. GANG CONSTANT FACTOR MEANS 15 Sheets-Sheet 6 Filed Feb. 16, 1948 37 INVENTO? BY 2 6,60 Om 80min r30).

ATTORNEYS Nov. 21, 1950 H. GANG CONSTANT FACTOR MEANS l5 Sheets-Sheet '7 Filed Feb. 16, 1948 mn/ewroe W 9 6(1) .00 Mm v61 ATTOPNEKS Nov. 21, 1950 H. GANG 2,531,205

CONSTANT FACTOR MEANS Filed Feb. 16, 1948 15 Sheets-Sheet 8 w INVEIgOR ATTORNEY$ Nov. 21, 1950 H. GANG CONSTANT FACTOR MEANS l5 Sheets-Sheet 9 Filed Feb. 16, 1948 INVENTOR Nov. 21, 1950 H. GANG 2,531,205

- CONSTANT FACTOR MEANS Filed Feb. 16, 1948 15 Sheets-Sheet 10 mgr/5:

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62(1) .o/k -e/bdk (10 ATTORNE Y5 Nov. 21, 1950 H. GANG 2,531,205

CONSTANT FACTOR MEANS Filed Feb. 16, 1948 15 Sheets-Sheet 11 A TTORNEY- Nov. 21, 1950 H. GANG 2,531,205

CONSTANT FACTOR MEANS Filed Feb. 16, 1948 15 Sheets-Sheet 12 INVENTOR BY JIM/mm 90025 w .G h buxom (7401 A TTORNE Y Nov. 21, 1950 H. GANG 2,531,205

CONSTANT FACTOR MEANS Filed Feb. 16, 1948 15 Sheets-Sheet 13 .INVENTOR ATTO R N EY Nov. 21, 1950 H. GANG 2,531,205

CONSTANT FACTOR MEANS Filed Feb. 16, 1948 15 Sheets-Sheet 14 ATTORNEYS Nov. 21, 1950 H. GANG 2,531,205

CONSTANT FACTOR MEANS Filed Feb. 16, 1948 15 Sheets-Sheet l5 INVENTOR BY 6(1) (wk/bu V04 ATTORNEY Patented Nov. 21, 1950 CONSTANT FACTOR MEANS Herman Gang, Livingston, N. 1., assignor to Monroe. Calculating Machine Company, Orange, N. 1., a corporation of Delaware Application February 1c, 1948, Serial No. 8,545

11 Claims. (01. 235-49) The invention relates to calculating machines, and has for an object to provide improved means for restoring multiplier values to denominational multiplier storage devices of the denominationally shiftable carriage of the machine for use as a constant factor in-a program of multiplication. Another object is to effect this restoration simultaneously with the clearing of the product register of the machine. Another object is to effect this restoration simultaneously with the clearing of the product and/or another register or registers of the machine. Other objects and advantages will appear hereinafter or will be obvious.

The invention consists in the novel construction and combinations of parts as hereinafter set forth in the claims.

In the accompanying drawings,

Figure 1 is a plan view of a calculating machine embodying the invention.

Figure 2 is a vertical section of the machine showing the keyboard and the clearout mechanisms.

Figure 3 is a detail vertical section through the main carriage and adjacent parts, showing the multiplier storage devices and the counting finger therefor.

Figure 4 is an enlarged detail horizontal section taken through one of the multiplier storage wheels and gears. I

Figure 5 is a detail vertical section through the sub-carriage, showing the pawls for holding the multiplier storage wheels and gears in adjusted position and the cams for releasing said pawls.

Figure 6 is a detail section on the line 6-6, Fig.4, showing a centralizing spring for a multiplier storage wheel. a I

Figure 7 is a right side elevation of the machine, with the casing removed.

Figure 8 is an enlarged right side elevation of the machine with the main carriage in section, showing the constant multiplier key and parts associated therewith.

Figure 9 is a left side elevation of the machine,

showing the switch control means for the clearout clutch.

Figure 10 is an enlarged right side elevation of the machine, showing portions of the controls for the clearout mechanism.

Figure 11 is a vertical section of the machine taken just inside the left hand side frame, showing certain linkage for the clearout mechanism and means for raising and lowering the main carriage. 1

Figure 12 is a left side elevation of the machine,

showing the clearout clutch and certain mechanisms associated therewith. Figure 13 is a partial section taken substantially on the line i 3-, Fig. 8, showing the multiplier storage devices and the keyboard with the cover plate and key buttons removed.

Figure 14 is a left side elevation of the machine, showing the parts in normal position.

Figure 15 is a plan view, partially in section,

of the main carriage, showing the latching comb and the subcarriage in adjusted position.

Figure 16 is a, detail perspective view of a multiplier storage wheel, the latching comb therefor and parts associated therewith.

Figure 1'1 is a detail left end view of the parts shown in Fig. 16. V

Figure 18 is a fragmentary plan View of certain portions of the clearout mechanism.

Figure 19 is a front elevation of the parts shown in Fi 18.

Figure 20 is a perspective view, with certain parts in exploded relationship, showing portions of the clearout mechanism and controls therefor.

Figure 21 is a fragmentary perspective view, showing a multiplier storage gear and wheel and parts associated therewith.

Figure 22 is a detail vertical section, showing a storage device and a twirler knob for the adjustment thereof.

Upper dial, lower dial and keyboard clearout mechanism The machine is provided with a one cycle clutch 464 (Figs. 12 and 14) which is selectively operated to return to zero the upper dials comprising the multiplier-quotient register, the lower dials II comprising the dividend-product register, or to restore keys I! which may be set on the keyboard lii. An upper dial clear key 465, a lower dial clear key 461 and a keyboard clear key 466 are grouped on the lower right hand side of the keyboard i0 (Fig. l). The depression of any one of the keys 466, 466, or 46! serves to engage the clutch 464 and to select the operation it will perform. The keys, however, are adapted to be depressed simultaneously, whereby the clutch 4'64 will operate a single cycle to simultaneously clear the indicated dials and/ or keyboard as follows:

Each of the stems of the clear keys 466, 466 and 461 is pivotally connected at its lower end to the forward ends respectivelyof levers 469, 410 and 4' which are fulcrumed, one behind the other, at their rear on a stud 412 fixed on the r ht hand s de frame. Lever m is shown in its entirety in Figure and levers 489 and 418 are of like configuration. The levers 489, 418 and 4" are provided with depending arms which terminate in horizontally disposed fingers 468'. 418 and 4H respectively, which are adapted for contact each with an arm of bell crank levers 413, 414 and 418 respectively. The bell crank levers are fulcrumed on a vertical shaft 416, Figure 19, suitably fixed and depending from a cutout section of the right hand side frame. The bell crank levers 413, 414 and 415 are pivotally connected to slides 411, 418 and 419 respectively which slides extend across the machine (Figs. 18, 19 and Thus depression of any one of the clear keys 488. 486 or 481 will rock its associated lever counterclockwise (Fig. 10) about the stud 412 and the finger 489, 418' or 411' will rock bell crank levers 418, 414 or 418 counterclockwise, thus moving slide 411, 418 or 418 to the left. The movement of any one of the slides to the left either singly or simultaneously with either one or both of the other slides releases a double latch 482, Figure 18, which allows the clearout clutch 484 to be engaged and selects the operation or operations to be powered by the clearout clutch. The double latch 482 which is normally in engagement with a shoulder 488' of a slide 488 (Figs. 12 and 18) holds said slide in its rearward position against the tension of a spring 48 I. The slide 488 is slidably supported at its forward end on a shaft 484 which extends across the machine and projects externally of the left hand side frame and is pivotally connected at its rearward end to an arm 485 fixed on shaft 488 which shaft is rotatably mounted in the side frame. The leftward ends of slides 411, 418 and 419 are in abutment with an upstanding car 482' of latch 482 (Figs. 18 and 19). Thus movement of one. or

more of the slides to the left will rock latch lever- 482 clockwise about its fulcrum against tension of spring 488, releasing slide 488 which will be pulled forward by its spring 4". 'lhe left hand ends of the slides 411, 418 and 419 are each provided with a recess and when a slide 411, 418 or 419 is moved to its active position, the forward end of released slide 488 will enter such recess and hold the slide 411, 418 or 418 in set position until the engaging end of slide 488 has been removed, when said slide 411, 418 or 418 will be restored to latched position. Clearout clutch 484 (Fig. 12) is driven by a suitable gear train from the electric motor and is of well-known construction in which a spring pawl mounted on the driven member of the clutch is held out of engagement with the driving member by a detent. For this purpose a detent 481 (Figs. 12 and i4) is fixed on shaft 488 and when the slide 488 is released and pulled forward by its spring, the shaft 488 through arm 485 will be rocked counterclockwise thus removing detent 481 from engagement with the pawl of clutch 484, thereby engaging the drive to the motor (Figs. 12 and 14) Upon engagement of the clearout clutch the circuit breaker for the electric motor must be closed. For this purpose, a lever 488 (Fig. 9), pivotally mounted on the frame is urged counterclockwise by a suitable spring. A horizontally disposed arm of the lever 498 is in contact with a pin on the arm 288 (Figs. 9 and 14) and the lever is restrained from rotation by a lug 49i on the slide 488 in blocking contact with a depending arm of the lever 498. When the slide 488 is released to move forward, the lever 498 is urged countzrclockwise by its spring and the forward end of lever 288 is lifted to close the circuit break r.

In order that the clutch 484 shall make one cycle of operation and then be disengaged, provision is made to return the detent 481 into positlon to engage the pawl of the clutch before the clutch has completed its cycle. To this end, the detent 481 is provided with an extension arm 492 (Figs. 12 and 14), the free end of which is provided with a cam face 482'. When the detent 481 is disengaged (Fig. 12), the free end of the arm 482 is moved downwardly, thus bringing the cam face 482' into position to be engaged by a pin 498 mounted on the driven member of the clutch 484. As the clutch 484 approaches its full cycle position, the pin 488 will contact cam face 482' raising arm 482 and thus moving detent 481 into position where it will engage the pawl of the clutch 464 and disconnect the drive when the clutch reaches full cycle position. As the detent 481 is fast on shaft 488, the shaft will be rocked clockwise, carrying arm 488 with it and moving slide 488 to the rear. The pin 488 of clutch 484 will pass under the cam face 482', providing sufflcient movement to bring the shoulder 488 of the slide 488 to the rear of the restraining arm of latch lever 482 (Fig. 18) which will be urged into latching position by spring 488. The slide 488 will then be urged forward by its spring into contact with the latch lever 482 and the arm 482 moved slightly downward (Figs. 14 and 18). The latch lever 482 operates as above described only if the c'earout keys 488, 488 and 481 have been released before the completion of clearout cycle. If the clearout keys have been released, the ear 482' abutting the ends cf the setting slides 411, 418 and 418 will move said slides to the right to their unset position. However. should a clear key be held depressed, a setting slide will be held to the left and by contact with car 482' hold the latch lever in clockwise rocked position out of the path of the shoulder 488' of slide 488 (Fig. 18).

I In this instance, a latch lever 484 having a common fulcrum with latch lever 482 will be urged clockwise by spring connection with latch lever 482, thus positioning it in the path of the shoulder of slide 488 and preventing forward movement of the slide. When the clearout keys are released, the latch lever 482 will then be free to be moved counterclockwise by spring 488 and return the slides 411, 418 or 419 to normal. As latch lever 482 is moved counterclockwise, it will by contact with latch lever 484 move the latter out of latching engagement with slide 488 and itse f be moved into latching position, thereby restraining said slide from forward movement (Fig. 18).

The clutch 484. during the forego cycle of operation, provides the power to o erate the mechanism adjusted to active po ition by one or more of the setting slides 411, 418 and 418. To this end, the driven member of the clutch 484 is provided with an eccentric cam 488 (Fig. 14). The eccentric cam is adapted to impart a reciprocatory movement to a link 488 which is attached at its forward end to a crank am 481 which is fixed on the shaft 484 which extends across the machine (Figs. 18 and 20). Thus when clutch 484 is-operated, the shaft 484 is rocked clockwise (Fig. 14), counterclockwise (Fig. 20) during the first half of the cycle and during the second half of the cycle is rocked back tonormal.

Slidably mounted on shaft 484 and positioned to the left of the right hand side frame, is a rearwardly extending arm 488 (Figs. 18 and 20) having a pin 488 extending to the left thereof.

Integral with arm 488 and positioned to the left in spaced relationship thereto is a member 880 provided with an upstanding portion having an open-end slot. Further to the left and fixed on shaft 484, is a collar 8M provided with an arm 882 extending to the right thereof and seated in the open-end slot of member 888. Fulcrumed on shaft 488 is a lever 803 (similar to lever 808, Figure 2), the forward end of which. is provided with an open-end slot the bottom of which is defined by an ear 888 which is offset to the right (Fig. 18). Normally the forward end of lever 888 is held downwardly by a rearwardly extending flnger 882' (Fig. 20) of the extension 882 of collar 88!, the pin 489 of lever 488 being positioned just above and out of contact with the ear 883'. However, depression of clearout key 488 for initiating the operation which will re store the upper dials 88 to zero, will, as heretofore described, move setting" slide 411 to the left. Slide 411 (Fig. 18) is provided with a projection 41'! (Figs. 18 and 20) having an open end slot which engages, the rim of member 888. Thus member 808 and arm 488 are moved to the left and the pin thereof into driving engagement with lever 583 through the slot in the forward end thereof. When shaft 484 is rocked by clearout clutch 484, arm 498 will therefore be rocked through arm 802 of collar 8 thus raising the forward end of the lever 883. The rearward end of lever 583 is pivotally connected to the bottom of a link 804 (Fig. 2) which is pivotally connected at its upper end to an arm 805 (Fig. 2)

splined on the carriage shaft 48!! and provided with a suitable bearing in the right hand side frame of the machine (Fig. 13). Thus, as the rearward end of lever 803 is lowered, shaft 488 will be rocked clockwise and through suitable linkage 888, shaft 881 mounted in the carriage will likewise be rocked clockwise. The rockine of shaft 581 will serve to return to zero the wheels 88 (Fig. 3) in the manner fullv disclosed in Patent No. 1,781.320 to L. P. Crosman. As shaft 484 is rocked clockwise back to normal, the pin of arm 498. by contact with ear 508, will move the forward end of lever 808 downwardly and at the end of the movement the finger 882' will further depress said lever, lowering car 883' slightly below the pin 488 of arm 498. at which time slide 411 will be restored to its normal position if key 485 has been released. However, if key 458 is held depressed, the restoration of the slide will take place upon release of said key. Should one or the other of thesettin'; slides 418 or 419 be moved to the left to initiate a cycle of clearout clutch 484 while slide 411 is in its normal position, the rocking movement of arm 488 will be ineffective to clear the wheels 88 as the pin of said arm is out o engagement with the slot on the forward end of lever 808.

The parts adjusted to active position by depression of key 481 and leftward movement of slide 419 for clearing'the lower dials If to zero are of similar construction as that for the upper dials. An arm 888 (Fi s. 2, 18 and 20) provided with a pin is moved into driving engagement with a lever 888 the lever being driven by an arm of a collar 8l8 which is fixed on shaft 484. The rearward end of lever 809 is pivotally connected to a link 8 (Figs. 2 and 11) which is pivotally connected to an arm H2 (Fig. 11) splined on the carriage shaft 488 and provided with a suitable bearing in the left hand side frame of the machine. Hence, when shaft 489 is rocked clockwise, shaft II will, through suitable link-- age 814 likewise be rocked clockwise and the wheels I: (Fig. 3) will be zeroized in accordance with the above-mentioned Patent No. 1,781,320.

As it is necessary that theintermediate gears in the carriage be out of mesh with the intermediate gears in the machine body (Fig. 3) when wheels I: are cleared, a clearout cycle of clutch 484 operates to raise the forward end ofthe carriage. A cam 822 (Fig. 14) rotated with the driven member of clutch 484 serves to depress an arm 828 at the beginning of aclearout cycle. Arm828 is fast on. shaft 448 and as said shaft is rocked counterclockwise, the carriage 2 is lifted through pairs of arms 441, links 448 and lifters 448; one each of which is shown in Fig. 11. As clutch 484 approaches its full cycle position, arm 828 is allowed to move upwardly as spring 481 connected to arm 488 (Fig. 7) pulls the carriage downwardly into its normal position. The depression of the clearout key 488 will initiate the operation to clear the keyboard ll of values which may be set up by depressed keys l8 as follows:

The keyboard construction is of the'weli-known type in which a set key l8 in any order is latched in depressed position by a bail 432 (Fig. 13) and in which the depression of another key in that order will move the bail to release the set key, the key which is now depressed being in turn latched in set position by said bail. Accordingly, provision is made to simultaneously depress the row of keys l8 extending across the front of the keyboard, one being provided for each order. Depression of these keys 18, which designate a zero value. serves only to move-the bails 482. thereby releasing the set keys in each order thus allowing the setting slides I! (Fig. 2) to return to normal and thus remove the values which may be set up on the actuators 8. The stem of each of the zero keys l8 terminates at its lower end in a horizontally disposed portion (Fi 2). Ex, tending across the machine is a bail 8i8 pivotally mounted on a shaft M8. The rearward edge of bail 8i8 overlies the horizontal lower ends of the zero keys I I and is in contact therewith when the keys are in released position. Thus, it will be seen that when bail III is rocked clockwise. the zero keys I. will be depressed. thereby releasing the value keys I 8 which may be set in each order. The zero keys II will then be held in latched position by the bails 432 (Fig. 13). The ball H8 is provided at its right hand end with a depending arm 8" (Fig. 10) adjacent the inner wall of the right hand side frame. A push link 8" is pivotally connected to the arm 8" and extends rearwardlv and in sliding contact with the inner wall of the right hand sid frame. Mounted on the rear end of link 8" is a stud 8" extending through a horirontally disposed slot in the side frame and provided with an enlarced head which prevents lateral displacement of the link 8". The stud 8|! is normally urged against the rear end of the slot in the side frame by a spring 828 (Fig. 10) through link III which is attached to the lower end of arm 8" of ball 8, thus maintaining said ball in its normal unrocked position. The shaft 484 extends through the right hand side frame externally thereof and is provided with an end portion. the sides of which are flattened to provide rotary drive to a member "I (Figs. 10 and 20) slidably mounted thereon. Member 82I is provided with an upstanding lug 82f normally positioned to the right and rear of the head of stud Ill (Fig. 18).

Clearout slide 418 extends to the right beyond the side frame and terminates in a rearward pro- Jection provided with a slot which engages a rim of member 5. Therefore, when the clearout key I is depressed and slide "I moved to the left, the lug HI of the member III will be brought into the plane of the head of stud lit. As the shaft 484 is rocked counterclockwise by action of clearout clutch 4, member III is also rocked and lug 52! will contact the head of stud ill moving it forward in the slot in the side frame. Thus bail SIS is rocked to clear the keyboard through arm ill and push link ill on the rear end of which the stud 5 I l is mounted. Thus means controlled by one, two or all of the clear keys 5, I, 461 will render the related clearing means operable and will close the clutch I in train with the motor, inasmuch as the depression of a clear key or keys will release the latch 482, thereby releasing the slide and closing said clutch; said latch, said slide and said clutch being common to and controlled by any one, two, or all three of said clear keys.

Multiplier storage devices In the specific embodiment of the invention herein disclosed, the multiplier storage devices including wheels 524 and gears (Figs. 3, l3 and are shown mounted in a sub-carriage 525. Sub-carriage 525 is mounted on'a splined shaft 521 which is located in the front and extends the length of main carriage 2. Shaft 541 is provided with suitable bearings in the end plates of the main carriage and is thereby adapted for rocking movement as will hereinafter appear. Sub-carriage 525 and the multiplier storage devices contained thereinis adapted for longitudinal movement relative to main carriage 2 as shownin Fig. 15 and as fully disclosed in my co-pending applications, Serial Nos. 8,548 and 8,547, filed of even date herewith said application, Serial No. 8,546, being continued in application Serial No. 57,943, filed November 2, 1948. The relative movement of the sub-carriage and storage devices to the main carriage, however, forms no part of the invention disclosed herein. Therefore, for the purposes of the present disclosure, the sub-carriage and storage devices are to be considered as fixed with respect to longitudinal movement in the normal rightmost position as shown in Fig. 13. Furthermore,

it will readily be seen from the foregoing thatthe multiplier storage devices may be directly mounted in the main carriage and in fixed relationship thereto with respect to longitudinal movement.

The denominationalseries of multiplier storage wheels 524 (Figs. 4 and 1b) are located at the front of sub-carriage 525 and are fixed to gears 536 to the left thereof by suitable rivets. Wheels 524 and gears 53! are rotatably mounted as units on sleeves which are provided with gears 53! integral therewith and located to the right of said wheels. Gears 531 are normally held .in fixed relationship to wheels I24 by centralizing springs 538 (Figs. 4 and 6) whereby gears '31, wheels 524 and gears 536 are normally adapted to be rotated as units on a shaft 53! extending the length of sub-carriage 525. Located to the rear and in constant mesh with gears 536 (Figs. 4 and 13) are the multiplier storage gears I" which are rotatably mounted on splined shaft 521.

A multiplier may be set in storage wheels I and gears ill in any suitable manner; for instance, as fully disclosed in my co -pending application. Serial No. 8,547 flied of even date herewith. However, as the set-up means forms no part of the present invention, a manually operable and simplified means is shown in Fig. 22. Each storage wheel I is provided with a twirler knob I ll integral therewith. The twirler knobs are of slightly larger diameter than wheels I24 and thereby extend outwardly through suitable openings a slight distance exteriorly of the front of sub-carriage Ill so that they are accessible for manipulation. The peripheries of the twirler knobs are provided with knurling, as shown in Fig. 22,'for ease of operation, and suitable openings (Figs. 1 and 15) are'provided in the sub-carriage so that the operator may observe the settings of the storage wheels.

Storage wheels I24 and gears I are held in adjusted position by click pawls "l, pivotally mounted on shaft 53! and located to the left of gears 8 (Fig. 4). Click pawls "I are biased counterclockwise (Fig. 3) (clockwise, Fig. 5) by a spring "4 extending the length of sub-carriage I2! and threaded through suitable openings in the partition plates thereof, and said pawis are provided with square lugs (Fig. 3) extending to the side from the ends thereof and adapted for engagement with the teeth of storage gears I. Said pawls "I thus'constitute spring-urged detentmeans for the gears ill. Cams 6 are splined on shaft I21 and are normally in counterclockwise position from the showing in Fig. 5 and when in normal position allow engagement of the lugs of pawls "I with storage gears I (Fig. 3). However, as will be described, when carriage 2 is rocked in any one of the clearout operations, splined shaft 521 and cams "i are rocked clockwise (Fig. 5) thereby rocking pawls 9: counterclockwise and out of engagement with gears I.

The multiplier storage devices are adapted for operation in connection with the control of a program of multiplication in which the set storage devices are successively counted back to zero. Such a program of multiplication is fully disclosed in my co-pending application, Serial No. 8,548, flied of even date herewith. The particular multiplication control means, however, which operate in the counting out of the storage devices form no part of the present invention, and the invention is therefore not restricted to use with the mechanism disclosed in the abovementioned co-pending application,

In accordance with the aforesaid co-pending application, storage gears"! are provided with rightwardly extending hubs "I (Figs. 4 and 13) terminating in end portions of slightly larger diameter. The hubs I are provided with recesses "2 (Fig. 3) which are adapted for registration with fingers "l which are rotatably mounted on shaft ill. When a value is set in a storage wheel I24 and gear I, the cooperating finger I will ride on the periphery of its hub Ill, and when the storage wheel and gear stand at zero the finger will be urged into the recess 54!. The storage wheels I24 and gears "I are successively counted back to zero by a counting finger 628 (Fig. 3) starting with the rightmost wheel and gear with main carriage 2 in its leftmost position.

A ball I (Figs. 3, 8 and 21) pivotally mounted in the main body of the machine controls registration and right carriage shift. Depending arms of fingers 543, which are in contact with the respective hubs I of storage gears I, are successively brought into registration with ball I which is spring urged in a clockwise direction.

9 Ifthereisavalueinthestorasegeanthearm of finger I will move ball I in a counterclockwise direction (Fig. 21) indicating registration. when the storage gear I is counted hack to zero by finger I20. finger "8 will be brought into registration with recess I42, thereby allowing ball I to be moved by its spring in clockwise direction to initiate a right carriage shift.

A second ball I (Fig. 21) pivotally mounted on the same shaft with ball serves to stop the machine when the last storage gear containingavalueis countedbacktoaero. Bail I is adapted for engagement with the depending arms of pawls I related to all of the storage devices to the left of the one in engagement with ball I. Thus, if there is a value in any one of the storage gears, bail I will be held against the tension of a suitable spring in counterclockwise direction and the operation of the machine will continue; either for registration or carriage shift. Furthermore. bail I is provided with a leftward extension which by contact with a pin NI of bail I (Fig. 21) will hold said ball in counterclockwise position if ball I is so held by finger I", thus continuing the operation of the machine. When allof the storage devices, however,

are counted back to zero, ball I will be allowed clockwise movement and the machine will be brought to rest.

From the foregoing. it will be seen that at the termination of the calculation, fingers I will be within the respective recesses 542 of the storage devices and held therein by balls 0 and I which are spring held in their clockwise positions. As fully disclosed and for reasons set forth in the referred to co-pending application, Serial No. 8,548, provision is made for rocking bails I and I in counterclockwise direction during any one of the clearout operations. It will be apparent, therefore, that when the balls are so rocked counterclockwise, fingers I will no longer be urged within recesses 542 and will therefore exert no restraining action against the rotation of storage gears 54!. As will presently appear, the release of fingers "3 by 'bails "H" is necessary for the operation of the devices of the invention when used in connection with the particular multiplication control as disclosed in the aforesaid co-pending application.

Restoring multiplier values In accordance with the invention, the setting of a lever "8 (Figs. 1, 8, and16) after a multiplier is set in the storage devices, provides for the return of the multiplier to the devices during a clearout operation initiated after the completion of the calculation. As described in the foregoing, carriage 2 h raised during any oneibf the clearout operations and it is this movement which effects the return of the multiplier to the storage devices. As described in connection with the clearout devices, the clearout operations for the multiplier dials, product dials and the keyboard may be effected by a 1 single operation of clearout clutch I which is initiated by simultaneous depression of clear keys I, I" and "1. Therefore, as it is desirable to clear the machine for another calculation, the preferred operation is to effect the return of themultiplier to the storage devices by the simultaneous clearout operation, although any one of the clearout operations will effect the return. The operation is effected as follows:

Multiplier storage wheel Ill, gears Ill fixed thereoniand gears I31 having the stated spring connections I" therewith (Figs. 4 and 6) are normally adapted to be rotated as units. The ends of centralizing springs "I have driving attachment respectively with pins extending inwardly from wheels 524 and gears 531. As viewed in Fig. 6, wheels 524 and gears III are biased in clockwise and counterclockwise directions respectively with the pins thereof in restraining engagement. It will be apparent, therefore, if gears 531 are held against rotation. wheels 524 may be moved in counterclockwise direction thus adding tension to springs "hand that if then wheels I are released, springs 53! will drive said wheels back in clockwise direction to their original setting. To lock gears 53! against rotation, a comb 691 (1"18. 8. l5 and 16) is adapted to be moved into looking engagement with gears ill upon setting of lever I" after a multiplier has been set in the storage devices.

Comb I81 mounted in carriage 2 extends longi tudinally thereof and is located to the rear of gears I31 and above storage gears 0 (Figs. 3,15 and 16). As most clearly seen in Fig. 16, comb 691 is provided with teeth 681 which are nor mally located to the right rear and out of contact with gears 531. The leftmost end of comb 891 extends outwardly through a suitable slot in the end plate of carriage 2 and is thereat provided with an open-end slot 698 extending to the rear at an angle towards the right of the forward edge of the comb. A guide pin 698 secured by a suitable bracket to the end plate of carriage 2, extends downwardly through said slot and the comb is held in normal position by arms 699 and which extend upwardly on either side of the end of comb 88! said arms being provided each with a suitable ear to which is attached the respective ends of a spring Ill. Spring "I biases arms 699100 towards each other and normally in contact with either side of a stop I02 comprising the inwardly turned lug of a plate fasten the end of shaft 521. Thus comb 691 is normally located in the position indicated in Fig. 16 and teeth 69'! out of engagement with gear 631. g

The rightmost end of comb 801 is pivotally mounted and supported on a lever 1 (Figs. 15 and 16) which is fulcrumed on a suitable bracket attached to a partition plate of carriage 2 to the left of and in spaced relationship to setting plate "I (to be described). It will be apparent, therefore, from an inspection of Figs. 15 and 16, that if lever fill is rocked in a clockwise direction, the rightmost end of comb 691 will be moved forward and towards the left and that due to guide pin 698 mounted upon the carriage frame and in registration with the angularly disposed cam slot 698' in comb 891 the leftmost end of the comb will be moved forward to the same extent. Thusthe cam slot 898' in comb 691 and the pin 6" mounted upon the carriage frame and engaging said slot constitute a cam device rendered effective upon manipulation of constant lever 886 to adjust said comb B91 in parallel with said gears 531. The pin "I is mounted upon bracket 898" secured to the leftmost end of the carriage frame. The movement of comb 691 will therefore rock arm Ill clockwise as shown in Fig. 17 against the tension of spring 10!. Thus the teeth 691' of comb 691 will be moved into engagement with gears 5", thereby locking said gears against rotation. It will he noted that a latch IN is shown n 

